M6

The class DiagramBehavior and DiagramRefreshBehavior
have been reworked to allow for easier subclassing and overriding.
Some before protected or private members and methods are now
accessible from subclasses and/or other behavior classes. This is a
minor API change.

The bug that canUpdate was not called
before updatedNeeded in some situations has finally been
fixed. Clients might need to adapt to the new behavior, before they
only got a warning that they do not behave correctly.